diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5df2289d8..31124cb14 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,3 +1,4 @@
+cmake_minimum_required(VERSION 2.8.9)
 project(okular)
 
 find_package(KDE4 4.6.0 REQUIRED)